diff --git a/index.js b/index.js
index 327d03e..958716d 100644
--- a/index.js
+++ b/index.js
@@ -440,25 +440,6 @@ module.exports = {
     return require('crypto').createHash(hasher).update(data, inputEncoding).digest(outputEncoding)
   },
 
-  regcode2aiid(code) {
-    if (typeof code === 'string' && /^[a-zA-Z0-9]+$/.test(code)) {
-      const alphabet = 'e5fcdg3hqa4b1n0pij2rstuv67mwx89klyz'
-      const base = 16367
-      code = code.toLowerCase()
-      let len = code.length
-      let num = 0
-      for (let i = 0; i < len; i++) {
-        num += alphabet.indexOf(code[i]) * Math.pow(alphabet.length, i)
-      }
-      let aiid = num / (base - alphabet.length) - base
-      if (aiid >= 0 && Number.isInteger(aiid)) {
-        // 允许 aiid===0：当第一个用户（aiid==1）登录时，需要一个系统默认的邀请码。
-        return aiid
-      }
-    }
-    return null
-  },
-
   getUserEndLanIp(callback) {
 		let recode = {};
 		let RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;